(CNN) -- International aid workers scrambling to get into Haiti face a series of obstacles, from an airport that is already overwhelmed to blocked roads and a lack of communication, electricity, food and water. 

And, as if that weren't enough, they will encounter a serious crime problem, a veteran disaster relief specialist told CNN. 

"Security now in this particular crisis has already been raised as a major, major issue," said Paul Sherlock, a senior humanitarian representative for Oxfam. 

"If you'd been in Haiti 25 years ago, even in Papa Doc's time, it was a pretty nasty dictatorship, and lots of people were killed. But infrastructure and services worked better then than they do now," he said. 

Francois "Papa Doc" Duvalier was president from 1957 to 1971. 

"It was safer to use public transport then than it was last year, certainly in terms of crime," he said. 

"Over the last 10, 15, 20 years, the gangs and the drug culture have taken hold of Haiti, and that is why over the last four to five years, the United Nations has been trying to administer security in the capital and all the provincial cities as well," he said. 

Nongovernmental organization workers "have not been using public transport or taxis because of the security risk they face. International aid workers certainly didn't." 

Aid workers on their way to Haiti now are not sure how to ensure their safety, he said. 

Some are "probably using U.N. military as escorts, but many NGOs are uncomfortable using any military escort. They have been going to the police, but I don't know, after what has happened, whether the police are in any better position to provide it." 

What are the answers to this following set of questions:

1. Is public transportation safe in Haiti?
2. What kind of workers are going to Haiti?
3. What are they up against?
4. How is communication in the area?
5. Is the enough power?
6. What about food and water?
7. Are all the roads passable?
8. How is the airport faring?
9. Who is Papa Doc?
10. Where?
11. What type of government did he run?
12. How did services compare from then to now?
13. Who might some be using to help protect them?
14. Who do a lot of NGOs turn to?
15. Are the going to be able to help?
16. What has become a problem over the past decades?
17. What else?
18. How long has the UN tried to help?
19. Where are they helping with security?
20. How will Aid workers stay safe?

Numbered answers:
1. No
2. International aid workers
3. a series of obstacles
4. lack of communication
5. No
6. lack of food and water.
7. No
8. overwhelmed
9. president from 1957 to 1971
10. Haiti
11. dictatorship
12. worked better
13. U.N. military
14. police
15. I don't know
16. drug culture
17. serious crime problem
18. last four to five years
19. in the capital and all the provincial cities
20. not sure how to ensure their safet